kc3-lang/angle/extensions/CHROMIUM_compressed_copy_texture.txt

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• Author : Geoff Lang
  Date : 2016-04-20 11:13:22
  Hash : 47110bf4
  Message : Implement CHROMIUM_copy_compressed_texture for D3D11. BUG=angleproject:1356 Change-Id: Id563997d2921cf558c52a781ae66d8bde58d1f2f Reviewed-on: https://chromium-review.googlesource.com/339847 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>

• extensions/CHROMIUM_compressed_copy_texture.txt

• Name
  
      CHROMIUM_copy_compressed_texture
  
  Name Strings
  
      GL_CHROMIUM_copy_compressed_texture
  
  Version
  
      Last Modifed Date: August 5, 2015
  
  Dependencies
  
      OpenGL ES 2.0 is required.
  
      GL_AMD_compressed_ATC_texture, GL_ATI_texture_compression_atitc,
      GL_EXT_texture_compression_dxt1, GL_ANGLE_texture_compression_dxt5,
      GL_EXT_texture_compression_s3tc and GL_OES_compressed_ETC1_RGB8_texture
      affects the definition of this extension.
  
  Overview
  
      This extension provides functionality for copying compressed textures. It
      adds a new function glCompressedCopyTextureCHROMIUM that works similarily
      to glCopyTextureCHROMIUM, but for compressed textures.
  
      Which compressed texture formats that this extension supports depends on
      the supported texture compression formats of the host GPU.
  
  Issues
  
      glCompressedCopyTextureCHROMIUM will first try to copy into a compressed
      texture of the same format as the source texture. If unsucessful, the
      destination texture format will be changed to GL_RGBA and the texture will
      be stored uncompressed.
  
  New Procedures and Functions
  
      The command
  
          void glCompressedCopyTextureCHROMIUM (GLuint source_id, GLuint dest_id)
  
      Copies the contents of a compressed texture referred to by <source_id> to
      <dest_id> texture.
  
      Texture level 0 is copied from the source image to level 0 of the
      destination texture.
  
      The internal format of the source texture must be one of the following
      symbolic constants: GL_ATC_RGB_AMD, GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD,
      GL_COMPRESSED_RGB_S3TC_DXT1_EXT, GL_COMPRESSED_RGBA_S3TC_DXT5_EXT,
      GL_ETC1_RGB8_OES
  
      The destination texture will be created or replaced with the same internal
      format as the source texture.
  
      INVALID_OPERATION is generated if internal format of source texture is not
      one of the valid formats described above.
  
      INVALID_OPERATION is generated if destination texture is immutable.
  
      INVALID_VALUE is generated if <source_id> or <dest_id> are not valid texture
      objects.
  
      INVALID_VALUE is generated if textures corresponding to <dest_id> have not
      been bound as GL_TEXTURE_2D object.
  
      INVALID_VALUE is generated if level 0 of the source texture is not defined.
  
  Errors
  
      None.
  
  New Tokens
  
      None.
  
  New State
  
      None.
  
  Revision History
  
      15/6/2015    Documented the extension.
      5/8/2015     Added glCompressedCopySubTextureCHROMIUM.
      1/6/2016     Remove glCompressedCopySubTextureCHROMIUM.
      1/8/2016     Remove <target> argument.